I hunt with cast bullets of .22 cal., .25 cal., 7mm, and all kinds of .30 cals., but for varmints and the like. I match bullet hardness to the velocities I use, but don't consider these cals. for use on big game, cast or jacketed bullets. I use my own lube which uses, beeswax and lots of Carnauba and don't have leading problems. On the average, accuracy is best with these small calibers at 1700-2100fps, my benchrest guns seem to do best at the high end of this(2100fps) and they are all .30 cals. I find that as you go down in dia., cals./ get fussy as to speed and accuracy. .22 cal. central fire are finickiest of all, and right now I'm playing with a new CPA .218 Mashburn Bee, and all I know so far is that it doesn't like 2200fps with cast bullets of pure linotype.